Question

1. viruses can be grown on culture media like bacteria. (click to select) 2. animal viruses always kill cells they infect. (click to select) 3. an envelope is acquired during which step of the viral life cycle? synthesis release penetration adsorption 4. all viruses leave a cell by exocytosis. (click to select)

Explanation:

1. Viruses are obligate intracellular parasites and cannot be grown on non - living culture media like bacteria. Bacteria can be grown on such media as they are living cells with their own metabolic machinery.
2. Animal viruses do not always kill the cells they infect. Some viruses establish latent or persistent infections where the host cell may survive for a long time.
3. In the viral life - cycle, an envelope is acquired during the release step. As the virus exits the host cell, it may take a portion of the host - cell membrane, which forms its envelope.
4. Not all viruses leave a cell by exocytosis. Non - enveloped viruses may leave the cell by cell lysis.

Answer:

1. False
2. False
3. Release
4. False